Keratex Mud Shield Powder 450g. Keratex Mud Shield Powder is a handy, easy to use powder that is applied to protect and cleanse the horse\\\'s legs in wet and muddy conditions. Keratex Mud Shield Powder is a lightweight talc that provides a protective, breathable, resilient and silky layer on the hair causing the mud and water to slide off. Keratex Mud Shield Powder comes in an easy to use bottle allowing the powder to be puffed onto the legs, pasterns and fetlocks. 450g.